Christina Aguilera
Xtina is best known for her unforgettable voice. She's been in the limelight since she was a teenager, but sometimes, she acts like she hasn't matured at all. Aguilera once made an entire store close down for an entire day just so she could shop there, which is sadly normal for very famous celebs like her. Even worse, she also made the staff on the clock stay out of the store while she looked so that she wouldn't be "bothered" by the masses.
Justin Bieber
This Canadian pop star is no stranger to negative media coverage. When J-Biebs was younger, he had a memorable rebellious streak that did some serious damage to his public image. Bieber used to be the talk of the town until he decided to spend his time spitting off balconies, spitting on fans, peeing in restaurant buckets, and yelling at audience members who wouldn't be silent during his shows. These days, the married man seems to have calmed down quite a bit.